Agilent Technologies N4413A, User Manual

Page: 58 / 234

Using the Multiport Test System
How to Remove Fixture Delay
Chapter 3 48
How to Remove Fixture Delay
A simple method of removing the delay of a fixture is to rotate the reference plane. This is also
referred to as port extension.
This approach works well for removing the effect of lines that have little insertion loss and a
very good impedance match. The system assumes the fixture to have 50
Ω
feed lines, even if
the reference impedance of the DUT is not 50
Ω
.
See “Setup > Modify Rotations…” on page 119 for more information.
How to Use Trace Memory
Trace memory provides a convenient means of comparing two or more sets of measured data,
either from measurements made during this session, or from data previously saved to files.
The
Trace Memory dialog box can be opened by selecting Data > Memory…
The software assigns colors to traces based on their status.
• The red data set (or trace) is considered current data, either from the most recent
measurement, the last file load, or from data management within the trace memory
function (
Identified MEM
→
Data ). The system supports one current data set. When you
use the math functions of the Trace Memory dialog box, like Data / Memory, the red
(current) trace is the “Data” part of the function.